<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form name="form"  action="/user/login" method="POST"> <!-- 3 -->
    <div class="form-group">
        <label >账号</label>
        <input type="text" class="form-control" name="username" value="" placeholder="账号" />
    </div>
    <div class="form-group">
        <label >密码</label>
        <input type="password" class="form-control" name="password" placeholder="密码" />
    </div>
    <a href="/io">文件</a>
    <input type="submit" id="login" value="Login" class="btn btn-primary" />
</form>
</body>
</html>